Connected: An Internet Encyclopedia
RFC 822 - 6.1. SYNTAX

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### 6.1. SYNTAX

         address     =  mailbox                      ; one addressee
                     /  group                        ; named list

         group       =  phrase ":" [#mailbox] ";"

         mailbox     =  addr-spec                    ; simple address
                     /  phrase route-addr            ; name & addr-spec

         route-addr  =  "<" [route] addr-spec ">"

         route       =  1#("@" domain) ":"           ; path-relative

         addr-spec   =  local-part "@" domain        ; global address

         local-part  =  word *("." word)             ; uninterpreted
                                                     ; case-preserved

         domain      =  sub-domain *("." sub-domain)

         sub-domain  =  domain-ref / domain-literal

         domain-ref  =  atom                         ; symbolic reference

Next: 6.2. SEMANTICS

Connected: An Internet Encyclopedia
RFC 822 - 6.1. SYNTAX